2004 GMC ENVOY XL service

If the service four-wheel drive light on the instrument
panel cluster stays on, you should take your vehicle
to your dealer for service. SeeService Four-Wheel Drive
Warning Light on page 3-48for further information.
Shifting into 4HI or A4WD
Turn the knob to 4HI or A4WD. This can be done at any
speed unless you are shifting out of 4LO. The indicator
light will ash while shifting. It will remain illuminated
when the shift is complete.
Shifting into 2HI
Turn the knob to 2HI. This can be done at any speed
unless you are shifting out of 4LO.
Shifting into 4LO
To shift to 4LO, the vehicle’s engine must be running
and the vehicle must be stopped or moving less than
2 mph (3.2 km/h) with the transmission in NEUTRAL (N).
The preferred method for shifting into 4LO is to have your
vehicle moving 1 or 2 mph (1.6 to 3.2 km/h). Turn the
knob to 4LO. You must wait for the 4LO indicator light to
stop ashing and remain illuminated before shifting your
transmission into gear.If you turn the knob to 4LO when your vehicle is in
gear and/or moving, the 4LO indicator light will ash
for 30 seconds and not complete the shift unless your
vehicle is moving less than 2 mph (3.2 km/h) and
the transmission is in NEUTRAL (N). After 30 seconds,
the transfer case will return to the setting last chosen.
Shifting Out of 4LO
To shift from 4LO to 4HI, A4WD or 2HI your vehicle must
be stopped or moving less than 2 mph (3.2 km/h) with the
transmission in NEUTRAL (N) and the engine running.
The preferred method for shifting out of 4LO is to have
your vehicle moving 1 or 2 mph (1.6 to 3.2 km/h). Turn
the knob to 4HI, A4WD or 2HI. You must wait for the 4HI,
A4WD or 2HI indicator light to stop ashing and remain
illuminated before shifting your transmission into gear.
If the knob is turned to 4HI, A4WD or 2HI when your
vehicle is in gear and/or moving, the 4HI, A4WD or 2HI
indicator light will ash for 30 seconds. It will not
complete the shift unless your vehicle is moving less
than 2 mph (3.2 km/h) with the transmission in
NEUTRAL (N).
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Mirrors
Automatic Dimming Rearview Mirror
with OnStar
®and Compass
Your vehicle may have an automatic-dimming rearview
mirror with a compass and the OnStar®system.
There are three additional buttons for the OnStar
®
system. See your dealer for more information on the
system and how to subscribe to OnStar®. SeeOnStar®
System on page 2-40for more information about the
services OnStar®provides.
Mirror Operation
When turned on, this mirror automatically dims to the
proper level to minimize glare from any headlamps
behind you after dark.
O(On/Off): This is the on/off button for the automatic
dimming feature and compass. Press the far left
button, located below the the mirror face, for up to
three seconds to turn the feature on and off. A light on
the mirror will be lit while the feature is turned on.
Compass Operation
Press the on/off button once to turn the compass on
or off.
There is a compass display in the window in the upper
right corner of the mirror face. The compass displays
a maximum of two characters. For example, “NE”
is displayed for north-east.
Compass Calibration
Press and hold the on/off button down for nine seconds
to activate the compass calibration mode. CAL will
be displayed in the compass window on the mirror.
The compass can be calibrated by driving the vehicle
in circles at 5 mph (8 km/h) or less until the display
reads a direction.
2-36

OnStar®System
Your vehicle may have this feature. OnStar®uses
global positioning system (GPS) satellite technology,
wireless communications, and state of the art call
centers to provide you with a wide range of safety,
security, information and convenience services.
A complete OnStar
®user’s guide and the terms and
conditions of the OnStar®Subscription Service
Agreement are included in your OnStar®-equipped
vehicle’s glove box literature. For more information, visit
www.onstar.com, contact OnStar
®at 1-888-4-ONSTAR
(1-888-466-7827), or press the blue OnStar®button
to speak to an OnStar®advisor 24 hours a day,
7 days a week.A completed Subscription Service Agreement is required
prior to delivery of OnStar
®services and prepaid
calling minutes are also required for OnStar®Personal
Calling and OnStar®Virtual Advisor use. Terms and
conditions of the Subscription Service Agreement can be
found at www.onstar.com.
OnStar®Services
One of the following plans is normally included for a
specic duration with each vehicle equipped with
OnStar
®. You can upgrade or extend your OnStar®
service plan to meet your needs.
Safe and Sound Plan

Automatic Notication of Air Bag Deployment
Emergency Services
Roadside Assistance
Stolen Vehicle Assistance
AccidentAssist
2-40

Remote Door Unlock
Remote Diagnostics
Online Concierge
Directions and Connections Plan

All Safe and Sound Plan services
Route Support
RideAssist
Information and Convenience Services
Luxury and Leisure Plan

All Directions and Connections Plan services
Personal Concierge
OnStar®Personal Calling
With OnStar®Personal Calling, you have a safer way to
stay connected while driving. It’s a hands-free wireless
phone that’s integrated into your vehicle. You can place
calls nationwide using voice-activated dialing with no
contracts and no additional roaming charges. To nd out
more about OnStar
®Personal Calling, refer to the
OnStar®owner’s guide in your vehicle’s glove box, or
call OnStar®at 1-888-4-ONSTAR (1-888-466-7827).
OnStar®Virtual Advisor
With OnStar®Virtual Advisor you can listen to your
favorite news, entertainment and information topics,
such as traffic and weather reports, stock quotes
and sports scores. You listen to your e-mail through
your vehicle’s speakers, and reply with your hands on
the wheel and your eyes on the road.
2-41

HomeLink®Transmitter
HomeLink®, a combined universal transmitter and
receiver, provides a way to replace up to three hand−held
transmitters used to activate devices such as gate
operators, garage door openers, entry door locks,
security systems and home lighting. Additional
HomeLink
®information can be found on the internet at
www.homelink.com or by calling 1-800-355-3515.If your vehicle is equipped with the HomeLink
®
Transmitter, it complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received,
including interference that may cause undesired
operation.
This device complies with RSS- 210 of Industry Canada.
Operation is subject to the following two conditions:
(1) this device may not cause interference, and (2) this
device must accept any interference received,
including interference that may cause undesired
operation of the device.
Changes and modications to this system by other than
an authorized service facility could void authorization
to use this equipment.
2-42

Instrument Panel Overview...............................3-4
Hazard Warning Flashers................................3-6
Other Warning Devices...................................3-6
Horn.............................................................3-7
Tilt Wheel.....................................................3-7
Turn Signal/Multifunction Lever.........................3-7
Exterior Lamps.............................................3-16
Interior Lamps..............................................3-18
Accessory Power Outlets...............................3-21
Ashtrays and Cigarette Lighter........................3-21
Climate Controls............................................3-22
Dual Climate Control System..........................3-22
Dual Automatic Climate Control System...........3-25
Rear Climate Control System.........................3-31
Climate Controls Personalization.....................3-34
Warning Lights, Gages, and Indicators............3-35
Instrument Panel Cluster................................3-36
Speedometer and Odometer...........................3-37
Tachometer.................................................3-37
Safety Belt Reminder Light.............................3-38
Air Bag Readiness Light................................3-38
Charging System Light..................................3-39Voltmeter Gage............................................3-40
Brake System Warning Light..........................3-40
Anti-Lock Brake System Warning Light.............3-42
Engine Coolant Temperature Gage..................3-42
Malfunction Indicator Lamp.............................3-43
Oil Pressure Gage........................................3-46
Change Engine Oil Light................................3-47
Security Light...............................................3-47
Cruise Control Light......................................3-48
Reduced Engine Power Light.........................3-48
Service Four-Wheel Drive Warning Light..........3-48
Check Gages Warning Light...........................3-49
Gate Ajar Light.............................................3-49
Fuel Gage...................................................3-50
Low Fuel Warning Light.................................3-50
Driver Information Center (DIC).......................3-51
DIC Operation and Displays...........................3-51
DIC Warnings and Messages.........................3-60
Audio System(s).............................................3-64
Setting the Time...........................................3-64
Radio with CD..............................................3-65
Radio with Cassette and CD..........................3-76
Section 3 Instrument Panel
3-1

Safety Belt Reminder Light
When the key is turned to RUN, a chime will come on
for several seconds to remind people to fasten their
safety belts, unless the driver’s safety belt is already
buckled.
The safety belt light will
also come on and stay
on for several seconds,
then it will ash for
several more.
If the driver’s belt is already buckled, neither the chime
nor the light will come on.
Air Bag Readiness Light
There is an air bag readiness light on the instrument
panel, which shows the air bag symbol. The system
checks the air bag’s electrical system for malfunctions.
The light tells you if there is an electrical problem.
The system check includes the air bag sensors, the air
bag modules, the wiring and the crash sensing and
diagnostic module. For more information on the air bag
system, seeAir Bag Systems on page 1-49.
This light will come on
when you start your
vehicle, and it will ash
for a few seconds.
Then the light should
go out. This means the
system is ready.
If the air bag readiness light stays on after you start
the vehicle or comes on when you are driving, your air
bag system may not work properly. Have your vehicle
serviced right away.
3-38

{CAUTION:
If the air bag readiness light stays on after you
start your vehicle, it means the air bag system
may not be working properly. The air bags in
your vehicle may not inate in a crash, or they
could even inate without a crash. To help
avoid injury to yourself or others, have your
vehicle serviced right away if the air bag
readiness light stays on after you start your
vehicle.
The air bag readiness light should ash for a few
seconds when you turn the ignition key to RUN.
If the light doesn’t come on then, have it xed so it
will be ready to warn you if there is a problem.
Charging System Light
The charging system light
will come on briey when
you turn on the ignition,
but the engine is not
running, as a check to
show you it is working.
It should go out once the engine is running. If it stays
on, or comes on while you are driving, you may have
a problem with the charging system. It could indicate
that you have problems with a generator drive belt,
or another electrical problem. Have it checked
right away. Driving while this light is on could drain
your battery.
If you must drive a short distance with the light on,
be certain to turn off all your accessories, such as the
radio and air conditioner.
3-39